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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2786) Create yarn cluster CLI to enable list node labels collection
Date Thu, 20 Nov 2014 17:17:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-2786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219598#comment-14219598

Allen Wittenauer commented on YARN-2786:

bq. Does this make sense?

No, it doesn't. It completely ignores 20+ years of industry experience towards operations
and configuration management of large scale installations.  This is mostly exemplified by
this comment:

bq.  I'd rather have the tools call an API instead of 'automatically' sshing into 1000 machines
and changing labels.

I'm completely stunned and saddened by this ignorance.  I suspect that there is a corporate
mandate to get Ambari working as a third tier scheduling system by dictating where services
run.  But that mandate (and its likely required deliverable time) has put blinders on the
architecture and may very well cause long term pain and could potentially prevent other, more
complex needs from being met.  

The only silver linings I'm seeing are thus:
* We still have time to undo the damage either now or in 3.x.
* Selfishly, this will give me years of material about how not to design a system to be operationally

> Create yarn cluster CLI to enable list node labels collection
> -------------------------------------------------------------
>                 Key: YARN-2786
>                 URL: https://issues.apache.org/jira/browse/YARN-2786
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, client, resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2786-20141031-1.patch, YARN-2786-20141031-2.patch, YARN-2786-20141102-2.patch,
YARN-2786-20141102-3.patch, YARN-2786-20141103-1-full.patch, YARN-2786-20141103-1-without-yarn.cmd.patch,
YARN-2786-20141104-1-full.patch, YARN-2786-20141104-1-without-yarn.cmd.patch, YARN-2786-20141104-2-full.patch,
> With YARN-2778, we can list node labels on existing RM nodes. But it is not enough, we
should be able to: 
> 1) list node labels collection
> The command should start with "yarn cluster ...", in the future, we can add more functionality
to the "yarnClusterCLI"

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